Aminoplast-based crosslinkers and powder coating...

Details Aminoplast-based crosslinkers and powder coating... Aminoplast-based crosslinkers and powder coating...

C - Chemistry, Metallurgy

08

K

C08K 5/357 (2006.01) C08J 3/24 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2420209

The present invention provides a crosslinking agent having reactive benzoxazine groups that is the ungelled reaction product of (a) at least one mono-hydroxy aromatic compound and (b) at least one aminotriazine compound having one or less non-alkylated NH group present in a molar ratio of reactant (a) to reactant (b) ranging from 1.0 to 3.0: 1.0, provided that where reactant (a) is a single ring monohydroxy aromatic compound, the molar ratio of reactant (a) to reactant (b) ranges from 1.0 to 1.8:1.0 and from 2.2 to 3.0:1Ø The crosslinking agent is essentially free of hydroxyl functionality and has a glass transition temperature of at least 25~C. The present invention is further directed to methods for preparing and using these crosslinking agents.

L'invention concerne un agent de réticulation comprenant des groupes benzoxazine qui est le produit de réaction non gélifié de (a) à moins un composé aromatique mono-hydroxy et (b) au moins un composé aminotriazine présentant au plus un groupe NH non alkylé présent en un rapport molaire entre un réactif (a) et un réactif (b) compris entre 1,0 et 3,0 :1,0, pour autant que quand le réactif (a) soit un composé aromatique monohydroxy à noyau unique, le rapport molaire entre un réactif (a) et un réactif (b) étant compris entre 1,0 et 1,8 :1,0 et entre 2,2 et 3,0 :1,0. L'agent de réticulation est sensiblement exempt de fonctionnalité hydroxyl et possède une température de transition vitreuse égale à au moins 25 ·C. L'invention concerne également des procédés de préparation et d'utilisation de ces agents de réticulation.

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